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docs: deduplicate AGENTS.md, defer to CLAUDE.md 📝

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Remove rebuild protocol, repo rules, SSH key strategy, and server
bootstrap info that was duplicated from CLAUDE.md. Keep only
agent-specific operational details and learnings.
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DannyDannyDanny 2026-03-30 23:44:38 +02:00
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AGENTS.md
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# Agent Instructions
## Nix/Darwin Rebuilds
See **CLAUDE.md** for build commands, rebuild protocol, flake architecture, repo rules, and SSH key strategy. This file covers agent-specific operational details.
**IMPORTANT**: When making changes to Nix configuration files (e.g., `nixos/home/danny/home.nix`, `nixos/flake.nix`, etc.), **always ask the user to rebuild** before assuming packages are available.
## Running commands on sunken-ship
To rebuild:
```bash
cd ~/dotfiles/nixos
darwin-rebuild switch --flake .
```
Do not automatically run rebuild commands - ask the user first.
On macOS, Alacritty colors follow **System Settings → Appearance** (no rebuild when toggling light/dark); see **CLAUDE.md** § Alacritty and `assets/alacritty/README.md`.
## Repo is public
No keys, tokens, or identifying secrets in the repo. Prefer `scp` or config outside the repo.
## SSH keys (one key per purpose)
We use **one key per purpose**, not one per machine: separate keys for server access, GitHub, Forgejo (and other forges if needed). Benefits: limit blast radius if a key is compromised; clear revocation; clear which key is for what.
- **Key names:** e.g. `id_ed25519_github`, `id_ed25519_forgejo`, `id_ed25519_servers` (Ed25519 preferred).
- **Config:** Use `~/.ssh/config` with `IdentityFile` and `IdentitiesOnly yes` per host so the right key is used. Keys and sensitive config stay outside the repo.
- **Server / NixOS:** Use actual key names on the machine (e.g. `id_ed25519_github`), not a generic `id_ed25519` (see Learnings below).
## Server installer USB (new machines only)
- Build: from **Linux** `cd ~/dotfiles/nixos && nix build .#installer-iso` (ISO is x86_64-linux only; cannot build on macOS). Or use official NixOS minimal ISO, write to USB, boot server, clone repo, run [scripts/nixos-server-install.sh](scripts/nixos-server-install.sh). See [docs/server-installer-usb.md](docs/server-installer-usb.md). Optional live WiFi: add `nixos/installer-wifi.nix` (gitignored) when building custom ISO on Linux.
## Learnings (NixOS server)
- Minimal ISO: use Ethernet or the graphical installer (Wi‑Fi on minimal is fiddly).
- Server hardware: stub in repo; user replaces with `nixos-generate-config --show-hardware-config` from the server.
- Root password: console only; set danny’s password as root once for sudo.
- SSH keys: use actual key names on the machine (e.g. `id_ed25519_github`), not assumed `id_ed25519`.
## Server (sunken-ship)
- **Commit and push** before testing on the server; it clones/pulls from origin.
- Bootstrap: server has no git until first rebuild. Use `nix run --extra-experimental-features "nix-command flakes" nixpkgs#git` to clone. Enable flakes in the daemon via `server-configuration-with-flakes.nix`: scp to server `/tmp/configuration.nix`, on server `sudo cp` to `/etc/nixos/configuration.nix`, then `sudo nixos-rebuild switch`. Then build flake and run `switch-to-configuration switch` (see nixos/readme.md).
- Auto-rebuild timer (`dotfiles-rebuild`) only runs after the system has been switched to the flake config. Check with `systemctl is-active dotfiles-rebuild.timer` on the server.
### Running commands on sunken-ship
From the Mac (where the dotfiles workspace lives), agents can SSH to sunken-ship to run commands. Use the sunken-ship key and the host alias or IP the user has configured (e.g. `ssh -i ~/.ssh/id_ed25519_sunken_ship danny@sunken-ship` or `danny@192.168.1.x`). Example:
From the Mac, agents can SSH to sunken-ship:
```bash
ssh -i ~/.ssh/id_ed25519_sunken_ship danny@sunken-ship 'hostname; ip addr'
```
Rebuild on the server (flake is in `nixos/`): `ssh ... 'cd /etc/dotfiles/nixos && sudo nixos-rebuild switch --flake .#sunken-ship'`. The server has WiFi (see [docs/sunken-ship-wifi.md](docs/sunken-ship-wifi.md)); it remains reachable when ethernet is unplugged.
Rebuild on the server: `ssh ... 'cd /etc/dotfiles/nixos && sudo nixos-rebuild switch --flake .#sunken-ship'`. The server has WiFi; it remains reachable when ethernet is unplugged.
## Server installer USB (new machines only)
Build from **Linux**: `cd ~/dotfiles/nixos && nix build .#installer-iso` (x86_64-linux only; cannot build on macOS). Or use official NixOS minimal ISO, write to USB, boot server, clone repo, run [scripts/nixos-server-install.sh](scripts/nixos-server-install.sh). See [docs/server-installer-usb.md](docs/server-installer-usb.md). Optional live WiFi: add `nixos/installer-wifi.nix` (gitignored) when building custom ISO on Linux.
## Learnings (NixOS server)
- Minimal ISO: use Ethernet or the graphical installer (Wi‑Fi on minimal is fiddly).
- Server hardware: stub in repo; user replaces with `nixos-generate-config --show-hardware-config` from the server.
- Root password: console only; set danny's password as root once for sudo.
- SSH keys: use actual key names on the machine (e.g. `id_ed25519_github`), not assumed `id_ed25519`.